Predict class for the test set and calculate prediction error after finding the PPtree structure, .
PPclassify( Tree.result, test.data = NULL, Rule = 1, true.class = NULL)
predict.class predicted class
predict.error prediction error
the result from PPtree_split
the test dataset
split rule 1:mean of two group means, 2:weighted mean, 3: mean of max(left group) and min(right group), 4: weighted mean of max(left group) and min(right group)
true class of test dataset if available
Lee, YD, Cook, D., Park JW, and Lee, EK(2013) PPtree: Projection pursuit classification tree, Electronic Journal of Statistics, 7:1369-1386.